GNC Pro Performance Bulk 1340 is a high-calorie mass gainer designed to support muscle energy, recovery, and growth. This scientifically formulated gainer contains 1,340 nutrient-dense calories and 50 grams of high-quality protein per serving to help increase size and overall body strength. It also provides 10 grams of glutamine, an important amino acid for maintaining a positive immune response and muscle function. Additionally, it includes 11 grams of branched-chain amino acids (BCAAs) for muscle recovery and growth, and creatine to help muscles produce energy for exercise. The product is tested and certified to be free of banned substances, tastes great, mixes easily, and is fast-absorbing.